Omit redundant nested if in stratisd.rs
Omit redundant nested if in stratisd.rs

This makes clippy happy, and the code is just as clear, or perhaps slightly
clearer.

Signed-off-by: mulhern <7b51bcf507bcd7afb72bf8663752c0ddbeb517f6@redhat.com>

mulkieran/stratisd,stratis-storage/stratisd,stratis-storage/stratisd,trgill/stratisd,stratis-storage/stratisd,trgill/stratisd,mulkieran/stratisd